web page error with script manager

Dkv

I added a progress bar on my page as shown in the code. But this page started giving me this error:Line: 1429
Error: Sys.ArgumentTypeException: Object of type 'Object' cannot be converted to type 'Array'.
Parameter name: array

This error is associated with script manager. Which ever page I put the script manager, it starts giving me the same error. Please help me to remove this error.asp:Content ID="Content2"ContentPlaceHolderID="ContentPlaceHolder1"Runat="Server">

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